John Chrysostom
God will do everything, and you take courage: “For it is God who works in you.” Therefore, if He Himself works, we on our part must show an intention that is always firm, concentrated, and not scattered. “For it is God who works in you both to will and to do.” If He works in us “to will,” then how do you exhort us? If God works in us “to will,” then in vain do you say to us, “you have obeyed.” We do not obey by ourselves. In vain do you say, “with fear and trembling,” because everything is God's work. I did not say, “For it is God who works in you both to will and to do,” for that reason. I said it to lessen your timidity. When you will, then He also will work “to will.” Do not fear and do not grow faint. He gives us both zeal and the activity itself.
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When we wish, He further strengthens our willing. For example, I wish to do something good. He accomplishes this good, and He also produces the willing. Either the Apostle's words must be understood in this way, or he says this with particular foresight, just as he also calls our virtues gifts of God. When he calls virtues gifts of God, he does not take away our self-activity, but leaves it in us. So also, by the words “God works” in us “to will,” he does not deprive us of self-activity. Rather, he shows that through good action we acquire a greater disposition to willing. As eagerness to act is born from acting, so from not acting comes unwillingness to act. Have you given alms? You have made yourself more disposed to give. Have you not given? You have become less disposed to give. Have you spent one day in self-restraint? You have an impulse for another also. Have you been lazy? You have strengthened laziness. “The ungodly, when he has come into the depth of evils, is negligent” (Prov 18:3). Therefore, as one who has come into the depth of evils is negligent, so one who has come into the depth of good things is zealous. As the former, despairing, becomes more negligent, so the latter, thinking on the multitude of good works, becomes more diligent, fearing lest he lose everything. “According to His good pleasure,” he says, that is, out of love for God, for the sake of pleasing Him, so that what is pleasing to Him and according to His will may be accomplished. Here the Apostle shows and assures us that God truly works, since He desires us to live according to His will. And if He desires this, and moreover Himself works, then He will surely accomplish it, because He wills that we live righteously. Do you see how self-activity is not taken away?